Once you do this it should present you with the standard Cinema 4D License Manager and give you the option to activate your Cinema 4D Lite license. You should notice that the files you deleted are re-created when Cinema 4D launches, this is because if Cinema 4D cannot find these files on startup it creates them from scratch with the default settings (this is why you need to quit C4D before deleting them). Once you've selected those items, delete them and then launch Cinema 4D again.

Once you've done that you will need to select three items: The Cinema 4D folder, the 'machines_rb_20.prf' and the 'teamrender_rb_20.prf' (you need the last two even if you do not use Team Render as Cinema 4D still stores some preferences data in those files).

Next, quit out of Cinema 4D from the Force Quit menu (this is a very important step as this process will not work if the application is running).

Open a Finder window and head to ~/Library/Preferences/MAXON via Finder's Go > Go to Folder command.

This is from Maxon themselves: 'To fix this issue all you have to do is delete the C4D preferences to restore the defaults. Hey David, I believe I have the solution for you. You don't have to do that 'Setup License Server' part.

Cinema 4d version